Why are sockets designed with neutral on the left and live wire on the right?
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1. Because statistics on electric shock incidents show that most people are right-handed, and when they are unable to pull out a plug, they instinctively change the depth of their grip. Extend the tip of the right thumb and use it as a pivot against the socket; in this way, once the plug is pulled out and a gap is created, the fingertip may bend and come into contact with the electrodes, resulting in an electric shock. The probability is higher than that for the index finger; therefore, international electrical conventions designate the left side as the neutral wire. 2. To standardize wiring and facilitate maintenance. It prevents the mixing of the live and neutral wires, which could lead to accidents, and it also ensures that electrical switches can properly cut off the live wire. 3. In electrical circuits, zero is on the left and live wire is on the right; in plumbing systems, hot water is on the left and cold water on the right. In restrooms, the men’s area is on the left and the women’s area on the right. It is a conventionally established norm. 4. The heart is located on the left side of the chest. Studies show that when an electric current flows from a person’s left hand to their feet, 67% of that current passes through the heart. From the right hand to the feet, 3.7% to the heart ； When moving from the right hand to the left hand, 3.3% of the current passes through the heart, while only 0.4% does so when moving from the left foot to the right foot. The setting of left zero and right fire is intended to minimize the likelihood of electric shock to the heart.
Left zero, right fire – for moving upward; some say it’s because the right hand is more responsive, allowing one to get free instantly even in case of an electric shock
1 When a person’s right hand is exposed to electricity, the current flows through the right hand and then through the body via the left foot, resulting in electric shock throughout the entire body. 2 When a person’s left hand is exposed to electricity, the current flows through the left hand and then through the body via the right foot, again causing electric shock throughout the body; in this case, the current passes through the heart, which can lead to electric shock shock or even death. Analyzing it in terms of bare wires: if the wiring is such that the left wire is neutral and the right wire is live, the probability of electric shock occurring in the right hand is higher than in the left hand. Even if an electric shock does occur, the current will not pass directly through the heart. Relatively speaking, the right hand reacts more quickly and will instinctively pull away, so the probability of electric shock in the left hand is much lower. The left hand is more likely to come into contact with the neutral wire rather than the live wire. In short, the configuration of left neutral and right live is intended to minimize the risk of electric shock to the heart. Therefore, when reaching out for electricity, it’s better to use the right hand
The heart is on the left to reduce the chance of damage
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The heart is on the left; left for zero and right for fire, in order to reduce the risk of people getting injured by accidental contact.